Build modified streamline images

The official image from streamline does not currently work for the arm64
platform. As a temporary measure, the source code and docker build scripts
have been lifted from the official images and are used to build locally.

Some additional modifications are made to reduce overall image size, these
are documented in docker/README.md

docker/streamline-src/vendor/hamcrest/hamcrest-php/tests/Hamcrest/UtilTest.php

@@ -0,0 +1,82 @@
+<?php
+namespace Hamcrest;
+
+use PHPUnit\Framework\TestCase;
+
+class UtilTest extends TestCase
+{
+
+    public function testWrapValueWithIsEqualLeavesMatchersUntouched()
+    {
+        $matcher = new \Hamcrest\Text\MatchesPattern('/fo+/');
+        $newMatcher = \Hamcrest\Util::wrapValueWithIsEqual($matcher);
+        $this->assertSame($matcher, $newMatcher);
+    }
+
+    public function testWrapValueWithIsEqualWrapsPrimitive()
+    {
+        $matcher = \Hamcrest\Util::wrapValueWithIsEqual('foo');
+        $this->assertInstanceOf('Hamcrest\Core\IsEqual', $matcher);
+        $this->assertTrue($matcher->matches('foo'));
+    }
+
+    public function testCheckAllAreMatchersAcceptsMatchers()
+    {
+        \Hamcrest\Util::checkAllAreMatchers(array(
+            new \Hamcrest\Text\MatchesPattern('/fo+/'),
+            new \Hamcrest\Core\IsEqual('foo'),
+        ));
+    }
+
+    /**
+     * @expectedException InvalidArgumentException
+     */
+    public function testCheckAllAreMatchersFailsForPrimitive()
+    {
+        \Hamcrest\Util::checkAllAreMatchers(array(
+            new \Hamcrest\Text\MatchesPattern('/fo+/'),
+            'foo',
+        ));
+    }
+
+    private function callAndAssertCreateMatcherArray($items)
+    {
+        $matchers = \Hamcrest\Util::createMatcherArray($items);
+        $this->assertInternalType('array', $matchers);
+        $this->assertSameSize($items, $matchers);
+        foreach ($matchers as $matcher) {
+            $this->assertInstanceOf('\Hamcrest\Matcher', $matcher);
+        }
+
+        return $matchers;
+    }
+
+    public function testCreateMatcherArrayLeavesMatchersUntouched()
+    {
+        $matcher = new \Hamcrest\Text\MatchesPattern('/fo+/');
+        $items = array($matcher);
+        $matchers = $this->callAndAssertCreateMatcherArray($items);
+        $this->assertSame($matcher, $matchers[0]);
+    }
+
+    public function testCreateMatcherArrayWrapsPrimitiveWithIsEqualMatcher()
+    {
+        $matchers = $this->callAndAssertCreateMatcherArray(array('foo'));
+        $this->assertInstanceOf('Hamcrest\Core\IsEqual', $matchers[0]);
+        $this->assertTrue($matchers[0]->matches('foo'));
+    }
+
+    public function testCreateMatcherArrayDoesntModifyOriginalArray()
+    {
+        $items = array('foo');
+        $this->callAndAssertCreateMatcherArray($items);
+        $this->assertSame('foo', $items[0]);
+    }
+
+    public function testCreateMatcherArrayUnwrapsSingleArrayElement()
+    {
+        $matchers = $this->callAndAssertCreateMatcherArray(array(array('foo')));
+        $this->assertInstanceOf('Hamcrest\Core\IsEqual', $matchers[0]);
+        $this->assertTrue($matchers[0]->matches('foo'));
+    }
+}